I am having quite the problem... When I get to the second light ball, door to get out of the room is blocked by the twilight pillars. I am on the latest dev build and have even tried it on 4.0 and 3.5. Door is stuck closed.

ALRIGHT! I fixed it! For future reference, I opened up the game in 3.5. Activated the Unlock All Portals AR code. Got to the room, saw the portal pillars falling. Saved. Quit. Unchecked the unlock all portals. Got to the room and Zant appeared! Thanks for getting me to think about the Game save!

Edit: awwwwww, right after I finished fixing the save file too
Well I'm glad you got the portals fixed, becasue that was the issue. (like the portals in the other room should not be there either). If your save file gets messed up again, try out mine.